The Yamaha RX-V663 can be found for 350-400 if you shop around. I know you want to spend 300, but wanted to let you know what else is close to help avoid any buyers remorse.
It might be helpful to take a look at Yamahas and Onkyos websites and compare the versions to see if there are any features you might like or see yourself wanting down the road.
Cheers,
ChunkyDark